<template>
    <div class="star" :class="starType">
        <span v-for="(itemClass, index) in itemClasses" :key=index :class="itemClass" class="star-item"></span>
    </div>
</template>
<script>
const LENGTH = 5;
const CLS_ON = 'on'
const CLS_HALF = 'half'
const CLS_OFF = 'off'
export default {
    props:{
        size:{
            type: Number
        },
        score: {
            type: Number
        }
    },
    computed:{
        starType(){
            return "star-"+ this.size
        },
        itemClasses(){
            let result = [];
            let score = Math.floor(this.score * 2) / 2
            let hasDecimal = score % 1 != 0
            let integer = Math.floor(score)
            for(let i = 0; i< integer; i++){
                result.push(CLS_ON)
            }
            if(hasDecimal){
                result.push(CLS_HALF)
            }
            while( result.length < LENGTH){
                result.push(CLS_OFF)
            }
            return result
        }
    }
}
</script>
<style lang="stylus">
@import "../../common/stylus/mixin.styl"
    .star
        font-size: 0
        .star-item
            display inline-block
            background-repeat no-repeat
        &.star-48
            .star-item
                width 20px
                height 20px
                margin-right 22px
                background-size 20px 20px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('star48_on')
                &.half
                    bg-image('star48_half')
                &.off
                    bg-image('star48_off')

        &.star-36
             .star-item
                width 15px
                height 15px
                margin-right 6px
                background-size 15px 15px
                &:last-child
                    margin-right 0
                &.on
                    bg-image('star36_on')
                &.half
                    bg-image('star36_half')
                &.off
                    bg-image('star36_off')
        &.star-24
             .star-item
                width 10px
                height 10px
                margin-right 3px
                background-size 10px 10px
                &.last-child
                    margin-right 0
                &.on
                    bg-image('star24_on')
                &.half
                    bg-image('star24_half')
                &.off
                    bg-image('star24_off')
        
</style>